/* teach - beheerpaneel (👥): gebruikers, klassen en scholen.
   Zichtbaar voor super (alles), admin (eigen school) en teacher (leerlingen). */
"use strict";
(function(){
  /* het beheerpaneel is een tabblad binnen Instellingen (settingsWrap/settingsModal),
     geen los venster meer - modal is alleen nog de content-container voor render() */
  const modal = document.getElementById("adminModal");
  let SCHOOLS = [], USERS = [], CLASSES = [], selSchool = null;
  /* schoolbeheerders van alle scholen, voor het Systeem-tabblad (super) */
  let SYS_ADMINS = [];
  /* huidige klas-toewijzingen (leerling-omgeving), per klas-id - opnieuw
     opgehaald bij elke reload() zoals CLASSES/USERS hierboven */
  let ASSIGNMENTS = {};
  /* openstaande aanmeldverzoeken van ouders (thuiskind -> deze school) */
  let LINK_REQUESTS = [];
  /* resultaat van een laatste multireset (klas/school): blijft zichtbaar
     totdat de beheerder het venster zelf sluit, zodat wachtwoorden niet
     meteen weer verdwijnen na een reload() */
  let resetResults = null;
  /* actief tabblad, blijft behouden over her-renders heen (na elke actie) */
  let adminTab = "gebruikers";
  /* live zoekfilter voor de gebruikerslijst, blijft ook behouden over her-renders */
  let userFilter = "";
  /* uitgeklapte leerling-groepen en gebruikersrijen (standaard alles dicht
     voor een rustig overzicht), blijven behouden over her-renders */
  const openGroups = new Set();
  const closedGroups = new Set();   /* door de gebruiker bewust dichtgeklapt */
  const openRows = new Set();

  /* welke rollen de ingelogde gebruiker mag aanmaken: unie over hoofdrol + extra rollen */
  const creatableRoles = () =>
    [...new Set([currentUser.role, ...(currentUser.extraRoles||[])].flatMap(r => CREATABLE_ROLES[r] || []))];

  const esc = s => String(s ?? "").replace(/&/g,"&amp;").replace(/</g,"&lt;");
  const h = (tag, cls, text)=>{
    const el = document.createElement(tag);
    if(cls) el.className = cls;
    if(text != null) el.textContent = text;
    return el;
  };
  /* wachtwoorden/koppelcodes zijn maar eenmalig zichtbaar - een kopieerknop
     zorgt dat ze veilig bewaard kunnen worden voordat het scherm ververst */
  async function copyText(btn, text){
    try{ await navigator.clipboard.writeText(text); }
    catch(e){
      const ta = document.createElement("textarea");
      ta.value = text; ta.style.position = "fixed"; ta.style.opacity = "0";
      document.body.appendChild(ta); ta.select();
      try{ document.execCommand("copy"); }catch(_){ /* niets meer te doen */ }
      document.body.removeChild(ta);
    }
    const orig = btn.textContent;
    btn.textContent = "✓";
    setTimeout(()=>{ btn.textContent = orig; }, 1200);
  }
  function copyBtn(text, cls){
    const b = h("button", cls || "am-btn", T("amCopy"));
    b.type = "button";
    b.addEventListener("click", e=>{ e.preventDefault(); if(text) copyText(b, text); });
    return b;
  }
  const msg = (t, copyValue) => {
    const m = modal.querySelector(".am-msg");
    if(!m) return;
    m.innerHTML = "";
    if(!t) return;
    m.appendChild(document.createTextNode(t));
    if(copyValue) m.appendChild(copyBtn(copyValue));
  };

  /* ---- één interactiesysteem voor het hele beheer ---------------------------
     field():    elk invoerveld/select krijgt een zichtbaar mini-label erboven
                 (een placeholder alleen is geen toelichting).
     dangerBtn(): acties met gevolgen (wachtwoord/koppelcode vernieuwen,
                 verwijderen, resetten) zien er anders uit dan gewone knoppen
                 en vragen een tweede klik als bevestiging (zelfde
                 arm-then-confirm als elders in de app); wapening loopt
                 vanzelf af. Geen native confirm()-dialogen meer.
     rowResults: nieuw gegenereerde wachtwoorden/codes verschijnen direct bij
                 de gebruiker in de rij (met kopieerknop), niet bovenaan. */
  function field(labelKey, control){
    const w = h("label","am-field");
    w.appendChild(h("span","am-field-lbl", T(labelKey)));
    w.appendChild(control);
    return w;
  }
  function dangerBtn(label, warnKey, fn){
    const b = h("button","am-btn am-danger", label);
    b.type = "button";
    if(warnKey) b.title = T(warnKey);
    let timer = null;
    b.addEventListener("click", async ()=>{
      if(!timer){
        b.classList.add("armed");
        b.textContent = T("amSure");
        timer = setTimeout(()=>{ timer = null; b.classList.remove("armed"); b.textContent = label; }, 4000);
        return;
      }
      clearTimeout(timer); timer = null;
      b.classList.remove("armed"); b.textContent = label;
      await fn(b);
    });
    return b;
  }
  /* per gebruiker het laatste credential-resultaat, overleeft de re-render
     na de actie zodat het bij de rij zichtbaar is tot het paneel sluit */
  const rowResults = new Map();
  document.addEventListener("userchange", ()=>rowResults.clear());
  function resultBadge(u){
    const r = rowResults.get(u.id);
    if(!r) return null;
    const badge = h("div","am-result");
    badge.appendChild(h("span", null, r.label + ":"));
    const code = h("code", null, r.value);
    badge.appendChild(code);
    badge.appendChild(copyBtn(r.value));
    return badge;
  }

  /* ---- groepskaart: één kader om wat bij elkaar hoort ------------------------
     Kop (grijs icoon + titel + samenvatting-als-toggle + Bewerken) met daaronder
     optioneel uitklapbare compacte subrijen en/of een uitklapbaar bewerkblok.
     De open-status leeft in een Set die re-renders overleeft; andere modules
     (bv. de Opslag-tab in image-catalog.js) geven hun eigen Set mee. */
  function groupCard(opts){
    const openSet = opts.openSet || openGroups;
    const editSet = opts.editSet || openRows;
    const card = h("div","am-card");
    const head = h("div","am-card-head");
    card.appendChild(head);
    if(opts.icon) head.appendChild(h("span","am-ico", opts.icon));
    head.appendChild(h("span","am-card-title", opts.title));
    const sum = h("span","am-card-sum");
    head.appendChild(sum);
    let tools = null;
    if(opts.edit){
      tools = h("div","am-card-tools");
      tools.appendChild(opts.edit.tools);
      const btn = h("button","am-edit", T("amEdit"));
      btn.type = "button";
      const ekey = opts.edit.key;
      const esync = ()=>{
        const open = editSet.has(ekey);
        tools.style.display = open ? "" : "none";
        btn.classList.toggle("on", open);
      };
      btn.addEventListener("click", ()=>{
        if(editSet.has(ekey)) editSet.delete(ekey); else editSet.add(ekey);
        esync();
      });
      esync();
      head.appendChild(btn);
      card.appendChild(tools);
    }
    if(opts.subs && opts.subs.length){
      const subHost = h("div","am-card-subs");
      opts.subs.forEach(el=>subHost.appendChild(el));
      card.appendChild(subHost);
      sum.classList.add("am-card-toggle");
      const sync = ()=>{
        const open = openSet.has(opts.key);
        sum.textContent = `${opts.summary} ${open ? "▾" : "▸"}`;
        subHost.style.display = open ? "" : "none";
      };
      sum.addEventListener("click", ()=>{
        if(openSet.has(opts.key)) openSet.delete(opts.key); else openSet.add(opts.key);
        sync();
      });
      sync();
    }else if(opts.summary){
      sum.textContent = opts.summary;
    }
    return card;
  }
  window.amGroupCard = groupCard;

  /* ---- beheer-secties in het instellingen-register (settings.js) ------------
     Elke sectie meldt zichzelf aan met rol-zichtbaarheid, een activate() en
     zoekgegevens; de schil bouwt daar navigatie + zoeken uit. Per rol alleen
     de essentie: groepsleiding ziet gebruikers/toewijzingen/voortgang,
     schoolbeheer ook klassen, de systeemmanager ook scholen en opslag. */
  const ADMIN_SECTIONS = [
    { tab:"gebruikers", icon:"👥", group:"school", order:10, labelKey:"amUsers", subKey:"stUsersSub",
      show:()=>true,
      keywords:()=>[T("amPupils"), T("roleTeacher"), T("roleAdmin"), T("amParents"), T("amLinkRequests"),
        T("amNewPw"), T("amParentCode"), "leerling","pupil","ouder","parent","wachtwoord","password",
        "koppelcode","aanmelding","enrolment"],
      search:q=>USERS
        .filter(u=>`${u.displayName} ${u.username}`.toLowerCase().includes(q))
        .map(u=>({ icon: u.role==="pupil" ? "🧒" : u.role==="parent" ? "👪" : "🧑‍🏫",
          label:u.displayName, sub:T(roleKey(u.role)),
          go:()=>goSettingsSection("gebruikers", { filter:u.displayName }) })) },
    { tab:"klassen", icon:"🏷", group:"school", order:11, labelKey:"amClasses", subKey:"stKlassenSub",
      show:()=>can("classes.manage"),
      keywords:()=>[T("amNewClass"), T("amResetClass"), "klas","class","groep","group"],
      search:q=>CLASSES
        .filter(c=>c.name.toLowerCase().includes(q))
        .map(c=>({ icon:"🏷", label:c.name, sub:T("amClasses"), go:()=>goSettingsSection("klassen") })) },
    { tab:"toewijzingen", icon:"🎯", group:"school", order:12, labelKey:"amAssignments", subKey:"stToewijzSub",
      show:()=>can("assignments.manage"),
      keywords:()=>[T("amModeWatch"), T("amModeWork"), "bord","board","delen","share","toewijzen","assign","widget"] },
    { tab:"voortgang", icon:"📈", group:"school", order:13, labelKey:"amProgress", subKey:"stVoortgangSub",
      show:()=>can("progress.view"),
      keywords:()=>["voortgang","progress","score","resultaten","results","tijdlijn","timeline"] },
    { tab:"scholen", icon:"🏫", group:"system", order:30, labelKey:"amSchools", subKey:"stScholenSub",
      show:()=>currentUser.role==="super",
      keywords:()=>[T("amNewSchool"), T("amNewSuper"), "school","systeemmanager","system manager"],
      search:q=>SCHOOLS
        .filter(s=>s.name.toLowerCase().includes(q))
        .map(s=>({ icon:"🏫", label:s.name, sub:T("amSchools"), go:()=>goSettingsSection("scholen") })) },
    { tab:"opslag", icon:"🖼", group:"system", order:32, labelKey:"stOpslag", subKey:"stOpslagSub",
      show:()=>currentUser.role==="super",
      keywords:()=>["opslag","storage","afbeeldingen","images","quota"] },
  ];
  const adminTabDefs = ()=>ADMIN_SECTIONS.filter(d=>d.show()).map(d=>[d.tab, T(d.labelKey)]);
  /* data één keer per bezoek aan Instellingen laden; secties onderling
     hergebruiken de lading (in-flight promise voorkomt dubbel laden) */
  let loadPromise = null;
  function ensureLoaded(force){
    if(force) loadPromise = null;
    if(!loadPromise){
      loadPromise = (async ()=>{
        /* super: selSchool null = nog niet gekozen (reload() zet dan de eerste
           school als default zodat klassen/gebruikers meteen een concrete
           school tonen); "" = bewust "alle scholen". Andere rollen: eigen school. */
        if(currentUser.role!=="super") selSchool = currentUser.schoolId;
        await reload();
      })();
    }
    return loadPromise;
  }
  /* settings.js roept dit bij het openen aan: verse data + zoekindex vullen */
  window.adminPrefetch = ()=>{ ensureLoaded(true).catch(()=>{}); };
  ADMIN_SECTIONS.forEach(d=>{
    registerSettingsSection({
      id:d.tab, icon:d.icon, group:d.group, order:d.order,
      label:()=>T(d.labelKey), sub:()=>T(d.subKey),
      visible:()=>!!currentUser && can("admin.access") && d.show(),
      async activate(payload){
        await ensureLoaded();
        if(d.tab==="gebruikers" && payload && payload.filter !== undefined) userFilter = payload.filter;
        showAdminHost();
        switchAdminTab(d.tab);
        if(d.tab==="gebruikers" && payload && payload.filter !== undefined){
          const panel = modal.querySelector('[data-panel="gebruikers"]');
          const inp = panel && panel.querySelector(".am-filter");
          if(inp){ inp.value = userFilter; applyUserFilter(panel); }
        }
      },
      keywords:d.keywords,
      searchItems:d.search,
    });
  });
  document.addEventListener("userchange", ()=>{
    if(!currentUser) resetResults = null;
    loadPromise = null;
    selectedUserKey = null;
    selSchool = null;   /* nieuwe sessie: laat reload() opnieuw defaulten */
  });

  async function reload(){
    let reloadError = null;
    try{
      if(currentUser.role==="super"){
        SCHOOLS = await api("/schools");
        /* eerste bezoek: kies meteen een concrete school i.p.v. het verwarrende
           "alle scholen" (klassen en per-school-lijsten zijn dan direct gevuld) */
        if(selSchool == null) selSchool = SCHOOLS.length ? String(SCHOOLS[0].id) : "";
      }
      const q = currentUser.role==="super" && selSchool ? "?school="+selSchool : "";
      USERS = (await api("/admin/users"+q)).users;
      /* het Systeem-tabblad toont schoolbeheerders van álle scholen, ook als
         de contextbalk op één school staat; zonder schoolfilter is USERS al
         compleet en is de extra call overbodig */
      if(currentUser.role==="super"){
        SYS_ADMINS = q ? ((await api("/admin/users")).users || []).filter(u=>u.role==="admin")
                       : USERS.filter(u=>u.role==="admin");
      }
      const cq = currentUser.role==="super" && selSchool ? "?school="+selSchool : "";
      CLASSES = (await api("/admin/classes"+cq)).classes || [];
      ASSIGNMENTS = {};
      if(CLASSES.length){
        const results = await Promise.all(CLASSES.map(c=>api("/assignments/class/"+c.id).catch(()=>({assignment:null}))));
        CLASSES.forEach((c,i)=>{ ASSIGNMENTS[c.id] = results[i].assignment; });
      }
      LINK_REQUESTS = [];
      if(currentUser.role!=="super" || selSchool){
        const lq = currentUser.role==="super" ? "?school="+selSchool : "";
        LINK_REQUESTS = ((await api("/admin/link-requests"+lq).catch(()=>({}))).requests) || [];
      }
    }catch(e){ USERS = []; CLASSES = []; ASSIGNMENTS = {}; LINK_REQUESTS = []; reloadError = e; }
    render();
    /* render() bouwt de modal (incl. .am-msg) helemaal opnieuw op, dus de
       melding pas ná render() zetten - anders wordt hij meteen weer gewist.
       Zonder dit bleef het paneel bij een fout stilletjes helemaal leeg staan
       zonder enige aanwijzing waarom. */
    if(reloadError) msg(T("amLoadError") + ": " + reloadError.message);
  }

  function classSel(current){
    const sel = h("select","am-sel");
    sel.appendChild(new Option(T("amNoClass"), ""));
    CLASSES.forEach(c=>sel.appendChild(new Option(c.name, c.id)));
    sel.value = current ?? "";
    return sel;
  }

  /* ---- gebruikers: master-detail ---------------------------------------------
     Links een compacte tabel (naam | functie | klas | status), rechts een vast
     detailpaneel waarin de geselecteerde gebruiker bewerkt wordt. De selectie
     overleeft reload(); credential-acties selecteren de gebruiker zodat het
     eenmalige wachtwoord/de code direct in het paneel zichtbaar is. */
  let selectedUserKey = null;   /* "u:<id>" | "req:<id>" | "new" | null */
  let masterHost = null, detailHost = null;

  function avatar(nameStr, big){
    const parts = String(nameStr || "?").trim().split(/\s+/);
    const ini = ((parts[0][0] || "?") + (parts[1] ? parts[1][0] : "")).toUpperCase();
    return h("span", "am-avatar" + (big ? " big" : ""), ini);
  }
  function userKlasText(u){
    if(u.role==="pupil"){
      const cls = CLASSES.find(c=>Number(c.id)===Number(u.classId));
      return cls ? cls.name : "";
    }
    if(u.role==="parent") return (u.childNames||[]).join(", ");
    return (u.classIds||[])
      .map(cid=>CLASSES.find(c=>Number(c.id)===Number(cid))?.name)
      .filter(Boolean).join(", ");
  }
  /* status compact als glyph met uitleg-title: ● in gebruik, ○ wacht nog op
     eerste login/activatie. Tekst clipte in de smalle statuskolom. */
  function userStatusGlyph(u){
    const waiting = u.pending || (u.role==="pupil" && !u.everLoggedIn);
    const label = u.pending ? T("amPending")
      : (u.role==="pupil" && !u.everLoggedIn) ? T("amNeverLoggedIn")
      : T("amStatusActive");
    const g = h("span","am-glyph" + (waiting ? "" : " ok"), waiting ? "○" : "●");
    g.title = label;
    g.setAttribute("aria-label", label);
    return g;
  }
  function nameCellFor(display, username){
    const cell = h("span","am-name");
    cell.appendChild(avatar(display));
    const nm = h("span","am-name-txt", display);
    if(username && display!==username) nm.appendChild(h("small","am-username"," · "+username));
    cell.appendChild(nm);
    return cell;
  }
  /* tabelrij in de gebruikerslijst: klik selecteert (geen her-render, zodat
     het zoekveld focus houdt); bewerken gebeurt in het detailpaneel */
  function userCells(u){
    const row = h("div","am-row am-tr");
    row.dataset.selkey = "u:"+u.id;
    row.appendChild(nameCellFor(u.displayName, u.username));
    row.appendChild(h("span","am-cell", T(roleKey(u.role))));
    row.appendChild(h("span","am-cell", userKlasText(u) || "—"));
    const stCell = h("span","am-cell am-status");
    stCell.appendChild(userStatusGlyph(u));
    row.appendChild(stCell);
    row.addEventListener("click", ()=>{ selectedUserKey = "u:"+u.id; syncSelection(); });
    return row;
  }

  /* het bewerkformulier van één gebruiker; wordt gebruikt door het
     detailpaneel (gebruikers) én inline door het Systeem-tabblad (subrijen) */
  function userTools(u, note){
    note = note || msg;
    const tools = h("div","am-tools");
    const actions = h("div","am-actions");
    const isStaff = ["teacher","admin","super"].includes(u.role);
    /* school koppelen/losmaken (systeemmanager): losse accounts terugzetten
       naar hun school, of bewust losmaken - super/ouder zijn per definitie
       schoolloos en vallen hierbuiten */
    if(currentUser.role==="super" && ["teacher","admin","pupil"].includes(u.role)){
      const ss = h("select","am-sel");
      ss.appendChild(new Option(T("amNoSchool"), ""));
      SCHOOLS.forEach(sc=>ss.appendChild(new Option(sc.name, sc.id)));
      ss.value = u.schoolId ?? "";
      ss.addEventListener("change", async ()=>{
        try{ await api("/admin/users/"+u.id, {method:"PATCH", body:{ schoolId: ss.value ? +ss.value : null }}); reload(); }
        catch(e){ note(e.message); ss.value = u.schoolId ?? ""; }
      });
      tools.appendChild(field("amFieldSchool", ss));
    }
    if(isStaff && can("users.role.change") && u.id!==currentUser.id){
      /* één functie per gebruiker: alleen de hoofdrol is te wijzigen (super);
         het aparte extra-functies-systeem is uit de UI gehaald */
      const rs = h("select","am-sel");
      ["teacher","admin","super"].forEach(r=>rs.appendChild(new Option(T(roleKey(r)), r)));
      rs.value = u.role;
      rs.addEventListener("change", async ()=>{
        try{ await api("/admin/users/"+u.id, {method:"PATCH", body:{role: rs.value}}); reload(); }
        catch(e){ note(e.message); }
      });
      tools.appendChild(field("amFieldRole", rs));
    }
    /* elke staf-rol eenvoudig aan klassen koppelen (groepsleiding,
       schoolbeheerder én systeemmanager): huidige klassen als chips met ✕,
       en een select om een klas toe te voegen */
    if(isStaff && can("classes.manage") && CLASSES.length){
      const wrap = h("div","am-classes");
      (u.classIds||[]).forEach(cid=>{
        const c = CLASSES.find(x=>Number(x.id)===Number(cid));
        if(!c) return;
        const chip = h("span","am-chip on", c.name);
        const x = h("button","am-chipx","✕");
        x.type = "button";
        x.title = T("amClassRemove");
        x.addEventListener("click", async ()=>{
          try{ await api("/admin/classes/"+cid+"/teachers", {body:{ userId: u.id, remove:true }}); reload(); }
          catch(e){ note(e.message); }
        });
        chip.appendChild(x);
        wrap.appendChild(chip);
      });
      const rest = CLASSES.filter(c=>!(u.classIds||[]).some(id=>Number(id)===Number(c.id)));
      if(rest.length){
        const addSel = h("select","am-sel");
        addSel.appendChild(new Option(T("amClassAdd"), ""));
        rest.forEach(c=>addSel.appendChild(new Option(c.name, c.id)));
        addSel.addEventListener("change", async ()=>{
          if(!addSel.value) return;
          try{ await api("/admin/classes/"+addSel.value+"/teachers", {body:{ userId: u.id }}); reload(); }
          catch(e){ note(e.message); }
        });
        wrap.appendChild(addSel);
      }
      tools.appendChild(field("amFieldClasses", wrap));
    }
    if(u.role==="pupil"){
      /* klas (uitwisselen met andere klassen) */
      const cs = classSel(u.classId);
      cs.addEventListener("change", async ()=>{
        try{ await api("/admin/users/"+u.id, {method:"PATCH", body:{classId: cs.value ? +cs.value : null}}); reload(); }
        catch(e){ note(e.message); }
      });
      tools.appendChild(field("amFieldClass", cs));
      /* wachtwoord inzien en aanpassen - alleen zichtbaar zolang de leerling
         nog niet is ingelogd; daarna kan alleen een nieuw wachtwoord gezet worden */
      const pwWrap = h("div","am-inline");
      const pw = h("input","am-pw");
      pw.value = u.password || "";
      pw.placeholder = u.everLoggedIn ? T("amPwHidden") : T("amPwTypePh");
      pw.addEventListener("keydown", ev=>ev.stopPropagation());
      pw.addEventListener("change", async ()=>{
        if(pw.value.length < 4) return;
        try{ await api("/admin/users/"+u.id, {method:"PATCH", body:{password: pw.value}}); reload(); }
        catch(e){ note(e.message); }
      });
      pwWrap.appendChild(pw);
      const pwCopy = h("button","am-btn", T("amCopy"));
      pwCopy.type = "button";
      pwCopy.addEventListener("click", e=>{ e.preventDefault(); if(pw.value) copyText(pwCopy, pw.value); });
      pwWrap.appendChild(pwCopy);
      tools.appendChild(field("amFieldPw", pwWrap));
      if(u.everLoggedIn){
        actions.appendChild(dangerBtn(T("amNewPw"), "amNewPwWarn", async ()=>{
          try{
            const { password } = await api("/admin/genpw?role=pupil");
            await api("/admin/users/"+u.id, {method:"PATCH", body:{password}});
            rowResults.set(u.id, { label: T("amResultPw"), value: password });
            selectedUserKey = "u:"+u.id;
            reload();
          }catch(e){ note(e.message); }
        }));
      }
      /* eenmalige ouder-code waarmee een ouder dit kind aan het eigen
         ouderaccount koppelt (ouderportaal); een eerdere code vervalt */
      actions.appendChild(dangerBtn(T("amParentCode"), "amParentCodeWarn", async ()=>{
        try{
          const r = await api("/admin/users/"+u.id+"/parent-code", { body:{} });
          rowResults.set(u.id, { label: T("amResultParentCode"), value: r.parentCode });
          selectedUserKey = "u:"+u.id;
          reload();
        }catch(e){ note(e.message); }
      }));
    }else{
      if(u.pending && u.linkCode){
        tools.appendChild(h("span","am-code", T("amCode")+": "+u.linkCode));
      }
      if(can("users.staffCredentials") && u.role!=="pupil" && u.id!==currentUser.id){
        actions.appendChild(dangerBtn(T("amNewCode"), "amNewCodeWarn", async ()=>{
          try{
            const r = await api("/admin/users/"+u.id, {method:"PATCH", body:{newLinkCode:true}});
            rowResults.set(u.id, { label: T("amResultCode"), value: r.linkCode });
            selectedUserKey = "u:"+u.id;
            reload();
          }catch(e){ note(e.message); }
        }));
        /* direct een nieuw wachtwoord zetten, zonder de koppelcode-activatie */
        actions.appendChild(dangerBtn(T("amNewPw"), "amNewPwWarn", async ()=>{
          try{
            const r = await api("/admin/users/"+u.id, {method:"PATCH", body:{generatePassword:true}});
            rowResults.set(u.id, { label: T("amResultPw"), value: r.password });
            selectedUserKey = "u:"+u.id;
            reload();
          }catch(e){ note(e.message); }
        }));
      }
    }
    if(u.id !== currentUser.id){
      const del = dangerBtn(T("amDelete"), "amDeleteWarn", async ()=>{
        try{ await api("/admin/users/"+u.id, {method:"DELETE"}); selectedUserKey = null; reload(); }
        catch(e){ note(e.message); }
      });
      actions.appendChild(del);
    }
    if(actions.childNodes.length) tools.appendChild(field("amFieldActions", actions));
    return tools;
  }

  /* inline-variant voor het Systeem-tabblad (schoolbeheerder-subrijen):
     naam + rol met een "Bewerken"-tekstknop die het formulier uitklapt */
  function userRow(u, opts){
    const compact = !!(opts && opts.compact);
    const row = h("div","am-row" + (opts && opts.sub ? " am-row-sub" : "") + (compact ? " am-card-sub" : ""));
    row.appendChild(h("span","am-name", u.displayName + (u.displayName!==u.username ? ` (${u.username})` : "")));
    if(compact){
      /* compacte kaart-subrij: status als glyph met uitleg-title i.p.v. tekst */
      row.appendChild(h("span","am-role", T(roleKey(u.role))));
      const glyph = h("span","am-glyph" + (u.pending ? "" : " ok"), u.pending ? "○" : "●");
      glyph.title = u.pending ? T("amPending") : T("amStatusActive");
      row.appendChild(glyph);
    }else{
      row.appendChild(h("span","am-role", T(roleKey(u.role)) + (u.pending ? ` · ${T("amPending")}` : "")));
    }
    const tools = h("div","am-row-tools");
    const badge = resultBadge(u);
    if(badge) tools.appendChild(badge);
    tools.appendChild(userTools(u));
    const edit = h("button","am-edit", T("amEdit"));
    edit.type = "button";
    const sync = ()=>{
      const open = openRows.has(u.id);
      tools.style.display = open ? "" : "none";
      edit.classList.toggle("on", open);
    };
    edit.addEventListener("click", ()=>{
      if(openRows.has(u.id)) openRows.delete(u.id); else openRows.add(u.id);
      sync();
    });
    sync();
    row.appendChild(edit);
    row.appendChild(tools);
    return row;
  }

  /* het detailpaneel rechts: leeg advies, gebruiker bewerken, aanmelding
     afhandelen of een nieuwe gebruiker aanmaken - afhankelijk van de selectie */
  function syncSelection(){
    if(!masterHost || !detailHost) return;
    /* selectie valideren tegen de actuele data (na reload kan hij weg zijn) */
    if(selectedUserKey && selectedUserKey.startsWith("u:")
       && !USERS.some(u=>"u:"+u.id===selectedUserKey)) selectedUserKey = null;
    if(selectedUserKey && selectedUserKey.startsWith("req:")
       && !LINK_REQUESTS.some(r=>"req:"+r.id===selectedUserKey)) selectedUserKey = null;
    masterHost.querySelectorAll(".am-tr").forEach(r=>r.classList.toggle("sel", r.dataset.selkey===selectedUserKey));
    const split = masterHost.closest(".am-split");
    if(split) split.classList.toggle("has-sel", !!selectedUserKey);
    renderDetail();
  }
  function detailHead(title, subtitle){
    const head = h("div","am-detail-head");
    head.appendChild(avatar(title, true));
    const txt = h("div","am-detail-title");
    txt.appendChild(h("h4", null, title));
    if(subtitle) txt.appendChild(h("span","am-role", subtitle));
    head.appendChild(txt);
    const close = h("button","am-btn am-detail-close", T("close"));
    close.type = "button";
    close.addEventListener("click", ()=>{ selectedUserKey = null; syncSelection(); });
    head.appendChild(close);
    return head;
  }
  function renderDetail(){
    if(!detailHost) return;
    detailHost.innerHTML = "";
    if(selectedUserKey === "new"){
      detailHost.appendChild(detailHead(T("amNewUser"), ""));
      detailHost.appendChild(newUserForm());
      return;
    }
    if(selectedUserKey && selectedUserKey.startsWith("u:")){
      const u = USERS.find(x=>"u:"+x.id===selectedUserKey);
      detailHost.appendChild(detailHead(u.displayName, T(roleKey(u.role)) + (u.displayName!==u.username ? ` · ${u.username}` : "")));
      const badge = resultBadge(u);
      if(badge) detailHost.appendChild(badge);
      /* fouten (bv. verwijderen mislukt) tonen we hier, waar de beheerder kijkt,
         niet alleen bovenaan het paneel (daar valt het buiten beeld) */
      const note = h("div","am-detail-msg formMsg");
      detailHost.appendChild(note);
      detailHost.appendChild(userTools(u, (t)=>{ note.textContent = t || ""; }));
      return;
    }
    if(selectedUserKey && selectedUserKey.startsWith("req:")){
      const r = LINK_REQUESTS.find(x=>"req:"+x.id===selectedUserKey);
      detailHost.appendChild(detailHead(r.pupil.displayName, `${T("amRequestOne")} · ${T("amRequestVia")} ${r.parent.displayName}`));
      detailHost.appendChild(requestTools(r));
      return;
    }
    detailHost.appendChild(h("div","am-detail-empty", T("amDetailEmpty")));
  }

  /* toevoegen vereist een bewuste extra stap: begint ingeklapt als alleen de "＋ …"-knop,
     pas na een klik verschijnen de invoervelden. presetClassId zet de klas-select alvast op
     de klas waar deze toevoegrij bij hoort (leerkracht/beheerder kan dit nog wijzigen). */
  function addForm(role, presetClassId){
    const label = T(role==="pupil" ? "amNewPupil" : role==="teacher" ? "amNewTeacher" : role==="admin" ? "amNewAdmin" : "amNewSuper");
    const wrap = h("div","am-add-wrap");
    const toggle = h("button","tbtn ghost", label);
    toggle.type = "button";
    wrap.appendChild(toggle);

    const f = h("div","am-add");
    f.style.display = "none";
    const name = h("input","am-inp");
    name.placeholder = T("amUserPh");
    name.addEventListener("keydown", ev=>ev.stopPropagation());
    f.appendChild(field("amFieldName", name));
    let cs = null;
    if(role==="pupil"){ cs = classSel(presetClassId ?? ""); f.appendChild(field("amFieldClass", cs)); }
    let pwInp = null;
    if(role!=="pupil"){
      /* optioneel: meteen zelf een wachtwoord instellen i.p.v. een koppelcode
         (die de gebruiker normaal zelf gebruikt om een wachtwoord te kiezen) */
      const pwWrap = h("div","am-inline");
      pwInp = h("input","am-inp am-pwinp");
      pwInp.type = "password";
      pwInp.autocomplete = "new-password";
      pwInp.placeholder = T("amPwOptional");
      pwInp.addEventListener("keydown", ev=>ev.stopPropagation());
      pwWrap.appendChild(pwInp);
      const gen = h("button","am-btn", T("amGenerate"));
      gen.type = "button";
      gen.addEventListener("click", async ()=>{
        try{
          const { password } = await api("/admin/genpw");
          pwInp.type = "text";
          pwInp.value = password;
        }catch(e){ msg(e.message); }
      });
      pwWrap.appendChild(gen);
      f.appendChild(field("amFieldPw", pwWrap));
    }
    /* een systeemmanager aanmaken is de meest ingrijpende actie in dit
       beheer (school-onafhankelijk, alle rechten overal) - vereist daarom
       als extra stap het eigen wachtwoord van de aanmaker zelf, ter
       bevestiging. De server controleert dit ook; dit is niet louter cosmetisch. */
    let confirmInp = null;
    if(role==="super"){
      confirmInp = h("input","am-inp");
      confirmInp.type = "password";
      confirmInp.autocomplete = "current-password";
      confirmInp.placeholder = T("amOwnPasswordPh");
      confirmInp.addEventListener("keydown", ev=>ev.stopPropagation());
      f.appendChild(field("amOwnPassword", confirmInp));
    }
    const go = h("button","tbtn", label);
    go.type = "button";
    go.disabled = true;
    const sync = ()=>{ go.disabled = name.value.trim().length < 2 || (confirmInp && !confirmInp.value); };
    name.addEventListener("input", sync);
    if(confirmInp) confirmInp.addEventListener("input", sync);
    /* fouten horen bij het formulier zelf, niet ergens bovenaan het paneel */
    const errEl = h("div","am-form-err");
    go.addEventListener("click", async ()=>{
      errEl.textContent = "";
      const body = { role, username: name.value.trim(), displayName: name.value.trim() };
      if(role==="pupil" && cs && cs.value) body.classId = +cs.value;
      if(pwInp && pwInp.value.trim()) body.password = pwInp.value.trim();
      if(currentUser.role==="super" && role!=="super") body.school = +selSchool;
      if(confirmInp) body.confirmPassword = confirmInp.value;
      try{
        const r = await api("/admin/users", { body });
        name.value = "";
        if(pwInp) pwInp.value = "";
        if(confirmInp) confirmInp.value = "";
        /* het wachtwoord of de koppelcode verschijnt direct bij de nieuwe
           gebruiker in de lijst (rij en groep klappen vanzelf open) */
        rowResults.set(r.user.id, {
          label: r.user.password ? T("amResultPw") : T("amResultCode"),
          value: r.user.password || r.user.linkCode,
        });
        openRows.add(r.user.id);
        if(role==="pupil"){
          openGroups.add(r.user.classId ? "class:"+r.user.classId : "class:none");
          openGroups.add("pupils");
        }
        reload();
      }catch(e){ errEl.textContent = e.message; }
    });
    f.appendChild(go);
    f.appendChild(errEl);
    wrap.appendChild(f);

    toggle.addEventListener("click", ()=>{
      toggle.style.display = "none";
      f.style.display = "flex";
      name.focus();
    });
    return wrap;
  }

  /* nieuw-gebruiker-formulier in het detailpaneel: eerst de rol kiezen
     (super aanmaken blijft op het Systeem-tabblad - die rol hoort niet bij
     één school), daarna de velden die bij die rol horen */
  function newUserForm(){
    const wrap = h("div","am-tools");
    const roles = creatableRoles().filter(r=>r!=="super");
    const roleSel = h("select","am-sel");
    roles.forEach(r=>roleSel.appendChild(new Option(T(roleKey(r)), r)));
    roleSel.value = roles.includes("pupil") ? "pupil" : roles[0];
    wrap.appendChild(field("amFieldRole", roleSel));
    const body = h("div","am-tools");
    wrap.appendChild(body);
    const build = ()=>{
      body.innerHTML = "";
      const role = roleSel.value;
      const name = h("input","am-inp");
      name.placeholder = T("amUserPh");
      name.addEventListener("keydown", ev=>ev.stopPropagation());
      body.appendChild(field("amFieldName", name));
      let cs = null;
      if(role==="pupil"){ cs = classSel(""); body.appendChild(field("amFieldClass", cs)); }
      let pwInp = null;
      if(role!=="pupil"){
        const pwWrap = h("div","am-inline");
        pwInp = h("input","am-inp am-pwinp");
        pwInp.type = "password";
        pwInp.autocomplete = "new-password";
        pwInp.placeholder = T("amPwOptional");
        pwInp.addEventListener("keydown", ev=>ev.stopPropagation());
        pwWrap.appendChild(pwInp);
        const gen = h("button","am-btn", T("amGenerate"));
        gen.type = "button";
        gen.addEventListener("click", async ()=>{
          try{
            const { password } = await api("/admin/genpw");
            pwInp.type = "text";
            pwInp.value = password;
          }catch(e){ msg(e.message); }
        });
        pwWrap.appendChild(gen);
        body.appendChild(field("amFieldPw", pwWrap));
      }
      const go = h("button","am-btn am-primary", T("amNewUser"));
      go.type = "button";
      go.disabled = true;
      name.addEventListener("input", ()=>{ go.disabled = name.value.trim().length < 2; });
      const errEl = h("div","am-form-err");
      go.addEventListener("click", async ()=>{
        errEl.textContent = "";
        const reqBody = { role, username: name.value.trim(), displayName: name.value.trim() };
        if(role==="pupil" && cs && cs.value) reqBody.classId = +cs.value;
        if(pwInp && pwInp.value.trim()) reqBody.password = pwInp.value.trim();
        if(currentUser.role==="super") reqBody.school = +selSchool;
        try{
          const r = await api("/admin/users", { body: reqBody });
          rowResults.set(r.user.id, {
            label: r.user.password ? T("amResultPw") : T("amResultCode"),
            value: r.user.password || r.user.linkCode,
          });
          if(role==="pupil"){
            openGroups.add(r.user.classId ? "class:"+r.user.classId : "class:none");
            openGroups.add("pupils");
          }
          /* de nieuwe gebruiker wordt direct geselecteerd: het eenmalige
             wachtwoord of de koppelcode staat dan in het detailpaneel */
          selectedUserKey = "u:"+r.user.id;
          reload();
        }catch(e){ errEl.textContent = e.message; }
      });
      body.appendChild(go);
      body.appendChild(errEl);
      setTimeout(()=>name.focus(), 0);
    };
    roleSel.addEventListener("change", build);
    build();
    return wrap;
  }

  /* paneel met het resultaat van een multireset (klas/school): een lijst
     nieuwe leerlingwachtwoorden die stuk voor stuk of allemaal ineens
     gekopieerd kunnen worden. Blijft staan tot de beheerder ✕ klikt. */
  function resetPanel(){
    if(!resetResults) return null;
    const box = h("div","am-reset");
    const head = h("div","am-reset-head");
    head.appendChild(h("strong",null, resetResults.title));
    const close = h("button","wclose","✕");
    close.addEventListener("click", ()=>{ resetResults = null; render(); });
    head.appendChild(close);
    box.appendChild(head);
    if(!resetResults.entries.length){
      box.appendChild(h("div","am-msg", T("amResetNone")));
      return box;
    }
    const all = resetResults.entries.map(en=>`${en.displayName}\t${en.password}`).join("\n");
    const copyAll = h("button","am-btn", T("amCopyAll"));
    copyAll.type = "button";
    copyAll.addEventListener("click", e=>{ e.preventDefault(); copyText(copyAll, all); });
    box.appendChild(copyAll);
    const list = h("div","am-reset-list");
    resetResults.entries.forEach(en=>{
      const row = h("div","am-reset-row");
      row.appendChild(h("span","am-name", en.displayName));
      row.appendChild(h("span","am-reset-pw", en.password));
      row.appendChild(copyBtn(`${en.displayName}: ${en.password}`));
      list.appendChild(row);
    });
    box.appendChild(list);
    return box;
  }

  /* systeem: overzicht van alle scholen + nieuwe school + systeemmanagers.
     De schoolkiezer-contextbalk is hier verborgen (zie switchAdminTab), want
     niets op dit tabblad hangt van een gekozen school af. Toevoegen zit
     achter een bewuste extra stap (＋-knop klapt het formulier uit, zoals
     bij gebruikers) en bevestigt daarna nog met de naam erin. */
  function renderScholenPanel(panel){
    SCHOOLS.forEach(s=>{
      const admins = SYS_ADMINS.filter(a=>Number(a.schoolId)===Number(s.id));
      /* bewerk-gereedschap van de school zelf (hernoemen/verwijderen) */
      const tools = h("div","am-tools");
      const nameInp = h("input","am-inp");
      nameInp.value = s.name;
      nameInp.maxLength = 80;
      nameInp.addEventListener("keydown", ev=>ev.stopPropagation());
      nameInp.addEventListener("change", async ()=>{
        const name = nameInp.value.trim();
        if(name.length < 2 || name === s.name) return;
        try{ await api("/admin/schools/"+s.id, {method:"PATCH", body:{ name }}); reload(); }
        catch(e){ msg(e.message); }
      });
      tools.appendChild(field("amFieldName", nameInp));
      const acts = h("div","am-actions");
      acts.appendChild(dangerBtn(T("amDelete"), "amDeleteSchoolWarn", async ()=>{
        try{
          await api("/admin/schools/"+s.id, {method:"DELETE"});
          if(String(selSchool)===String(s.id)) selSchool = "";
          reload();
        }catch(e){ msg(e.message); }
      }));
      tools.appendChild(field("amFieldActions", acts));
      /* één kader om de school en haar beheerders; beheerders standaard
         ingeklapt achter de teller, als compacte subrijen */
      panel.appendChild(groupCard({
        icon:"🏫",
        title:s.name,
        summary:`${admins.length} ${(admins.length===1 ? T("amAdminOne") : T("amAdmins")).toLowerCase()}`,
        key:"schooladmins:"+s.id,
        edit:{ key:"school:"+s.id, tools },
        subs: admins.map(a=>userRow(a, { sub:true, compact:true })),
      }));
    });

    const wrap = h("div","am-add-wrap");
    const toggle = h("button","tbtn ghost", T("amNewSchool"));
    toggle.type = "button";
    wrap.appendChild(toggle);
    const f = h("div","am-add");
    f.style.display = "none";
    const inp = h("input","am-inp");
    inp.placeholder = T("amSchoolNamePh");
    inp.maxLength = 80;
    inp.addEventListener("keydown", ev=>ev.stopPropagation());
    f.appendChild(field("amFieldName", inp));
    const add = h("button","tbtn", T("amNewSchool"));
    add.type = "button";
    add.disabled = true;
    let armTimer = null;
    const disarm = ()=>{ clearTimeout(armTimer); armTimer = null; add.classList.remove("danger"); add.textContent = T("amNewSchool"); };
    inp.addEventListener("input", ()=>{ add.disabled = inp.value.trim().length < 2; disarm(); });
    add.addEventListener("click", async ()=>{
      const name = inp.value.trim();
      if(name.length < 2) return;
      if(!armTimer){
        add.classList.add("danger");
        add.textContent = `${T("amNewSchoolConfirm")} “${name}”?`;
        armTimer = setTimeout(disarm, 5000);
        return;
      }
      disarm();
      try{
        const r = await api("/admin/schools", { body:{ name } });
        selSchool = r.school.id; inp.value = "";
        reload();
      }catch(e){ msg(e.message); }
    });
    f.appendChild(add);
    wrap.appendChild(f);
    toggle.addEventListener("click", ()=>{
      toggle.style.display = "none";
      f.style.display = "flex";
      inp.focus();
    });
    panel.appendChild(wrap);
  }

  /* klassen (admin/super binnen de gekozen school). Een klas hoort altijd bij
     een school; de systeemmanager kan een klas naar een andere school
     verplaatsen. Zonder gekozen school ("alle scholen") is er geen concrete
     school om klassen bij te tonen of aan te maken. */
  function renderKlassenPanel(panel){
    if(currentUser.role==="super" && !selSchool){
      panel.appendChild(h("div","guestnote", T("amPickSchoolFirst")));
      return;
    }
    const canResetPw = can("schools.resetPasswords");
    const otherSchools = SCHOOLS.filter(sc=>String(sc.id)!==String(selSchool));
    CLASSES.forEach(c=>{
      const pupilCount = USERS.filter(u=>u.role==="pupil" && Number(u.classId)===Number(c.id)).length;
      let edit = null;
      if(canResetPw){
        const tools = h("div","am-tools");
        /* systeemmanager: klas naar een andere school verplaatsen */
        if(currentUser.role==="super" && otherSchools.length){
          const ss = h("select","am-sel");
          ss.appendChild(new Option(T("amMoveToSchool"), ""));
          otherSchools.forEach(sc=>ss.appendChild(new Option(sc.name, sc.id)));
          ss.addEventListener("change", async ()=>{
            if(!ss.value) return;
            try{ await api("/admin/classes/"+c.id, {method:"PATCH", body:{ schoolId: +ss.value }}); reload(); }
            catch(e){ msg(e.message); }
          });
          tools.appendChild(field("amFieldMoveSchool", ss));
        }
        const acts = h("div","am-actions");
        acts.appendChild(dangerBtn(T("amResetClass"), "amConfirmReset", async ()=>{
          try{
            const r = await api("/admin/classes/"+c.id+"/reset-passwords", {method:"POST"});
            await reload();
            resetResults = { title: `${T("amResetClass")}: ${c.name}`, entries: r.users };
            render();
          }catch(e){ msg(e.message); }
        }));
        acts.appendChild(dangerBtn(T("amDelete"), "amDeleteClassWarn", async ()=>{
          try{ await api("/admin/classes/"+c.id, {method:"DELETE"}); reload(); }
          catch(e){ msg(e.message); }
        }));
        tools.appendChild(field("amFieldActions", acts));
        edit = { key:"klas:"+c.id, tools };
      }
      panel.appendChild(groupCard({
        title:c.name,
        summary:`${pupilCount} ${(pupilCount===1 ? T("amPupilOne") : T("amPupils")).toLowerCase()}`,
        edit,
      }));
    });
    /* lege school: maak duidelijk dat er (nog) geen klassen zijn en dat
       bestaande klassen bij een andere school kunnen horen */
    if(!CLASSES.length){
      panel.appendChild(h("div","guestnote", T("amNoClassesHere")));
    }
    if(canResetPw){
      const f = h("div","am-add");
      const inp = h("input","am-inp");
      inp.placeholder = T("amClassNamePh");
      inp.maxLength = 80;
      inp.addEventListener("keydown", ev=>ev.stopPropagation());
      f.appendChild(field("amFieldName", inp));
      const go = h("button","tbtn", T("amNewClass"));
      go.type = "button";
      go.disabled = true;
      inp.addEventListener("input", ()=>{ go.disabled = inp.value.trim().length < 2; });
      go.addEventListener("click", async ()=>{
        if(inp.value.trim().length < 2) return;
        try{
          await api("/admin/classes", { body:{ name: inp.value.trim(), school: selSchool ? +selSchool : undefined } });
          reload();
        }catch(e){ msg(e.message); }
      });
      f.appendChild(go);
      panel.appendChild(f);

      /* multireset: alle leerlingwachtwoorden van de hele school in één keer */
      panel.appendChild(dangerBtn(T("amResetSchool"), "amConfirmResetSchool", async ()=>{
        const schoolId = currentUser.role==="super" ? selSchool : currentUser.schoolId;
        if(!schoolId) return;
        try{
          const r = await api("/admin/schools/"+schoolId+"/reset-passwords", {method:"POST"});
          await reload();
          resetResults = { title: T("amResetSchool"), entries: r.users };
          render();
        }catch(e){ msg(e.message); }
      }));
    }
  }

  /* toewijzingsrij: kies een van je eigen borden (uit BS, board.js) voor een klas of
     een individuele leerling. Geen momentopname - de leerling-pagina zoekt het bord
     live op, dus nieuwe woorden die je toevoegt komen vanzelf door zonder opnieuw
     toe te wijzen. Een expliciete "Toewijzen"-knop i.p.v. direct bij het kiezen van
     een bord opslaan, zodat een klas-brede wijziging niet per ongeluk gebeurt. */
  /* widgets van een eigen bord (voor de één-widget-keuze in assignmentRow);
     widgets zonder wid komen uit borden van vóór v0.3.13 en verschijnen pas
     na de eerstvolgende save van dat bord */
  function boardWidgets(boardId){
    let found = null;
    BS.folders.forEach(fo=>fo.boards.forEach(bo=>{ if(bo.id===boardId) found = bo; }));
    return ((found && found.data && found.data.widgets) || []).filter(w=>w.wid);
  }
  function describeCurrent(current){
    if(!current) return "";
    let s = `${T("amAssignedAs")} “${current.boardName || current.boardId}”`;
    if(current.widgetId){
      const wName = current.widgetType ? T("wg_"+current.widgetType) : current.widgetId;
      s += ` › ${wName} (${current.mode==="kijken" ? T("amModeWatch") : T("amModeWork")})`;
    }
    return s;
  }
  function assignmentRow(target, boardOptions, current){
    const sel = h("select","am-sel");
    sel.appendChild(new Option(T("amNoAssignment"), ""));
    boardOptions.forEach(b=>sel.appendChild(new Option(b.label, b.id)));
    sel.value = current ? current.boardId : "";
    /* keuze: heel bord (default, bestaand gedrag) of één widget + modus */
    const widgetSel = h("select","am-sel am-widget-sel");
    const modeSel = h("select","am-sel am-mode-sel");
    modeSel.appendChild(new Option(T("amModeWork"), "werken"));
    modeSel.appendChild(new Option(T("amModeWatch"), "kijken"));
    const syncWidgetSel = ()=>{
      widgetSel.innerHTML = "";
      widgetSel.appendChild(new Option(T("amWholeBoard"), ""));
      boardWidgets(sel.value).forEach(w=>widgetSel.appendChild(new Option(T("wg_"+w.id), w.wid)));
      widgetSel.value = (current && current.boardId===sel.value && current.widgetId) ? current.widgetId : "";
      widgetSel.style.display = sel.value ? "" : "none";
      syncModeSel();
    };
    const syncModeSel = ()=>{ modeSel.style.display = (sel.value && widgetSel.value) ? "" : "none"; };
    modeSel.value = current && current.mode ? current.mode : "werken";
    sel.addEventListener("change", syncWidgetSel);
    widgetSel.addEventListener("change", syncModeSel);
    const info = h("span","am-code", describeCurrent(current));
    syncWidgetSel();
    const apply = h("button","am-btn", T("amAssign"));
    apply.type = "button";
    apply.addEventListener("click", async ()=>{
      try{
        if(sel.value){
          const body = { boardId: sel.value };
          if(widgetSel.value){ body.widgetId = widgetSel.value; body.mode = modeSel.value; }
          await api(`/assignments/${target.type}/${target.id}`, {method:"PUT", body});
        }
        else await api(`/assignments/${target.type}/${target.id}`, {method:"DELETE"});
        if(target.type==="class"){ await reload(); }
        else{
          const a = (await api("/assignments/pupil/"+target.id)).assignment;
          info.textContent = describeCurrent(a);
          msg(T("amAssignSaved"));
        }
      }catch(e){ msg(e.message); }
    });
    /* kop toont compact de huidige stand; de keuzes klappen uit via Bewerken */
    const tools = h("div","am-tools");
    const inline = h("div","am-inline");
    inline.appendChild(sel);
    inline.appendChild(widgetSel);
    inline.appendChild(modeSel);
    inline.appendChild(apply);
    tools.appendChild(inline);
    tools.appendChild(info);
    return groupCard({
      title: target.label,
      summary: describeCurrent(current) || T("amNoAssignment"),
      edit: { key: "assign:"+target.type+":"+target.id, tools },
    });
  }

  /* vult een <select> met leerlingen gegroepeerd per klas (optgroup), gedeeld
     tussen de Toewijzingen- en Voortgang-tab die beide één leerling kiezen */
  function fillPupilSelect(sel, pupils){
    sel.appendChild(new Option(T("amPickPupil"), ""));
    const byClass = new Map();
    pupils.forEach(u=>{
      const key = u.classId || "none";
      if(!byClass.has(key)) byClass.set(key, []);
      byClass.get(key).push(u);
    });
    const addGroup = (label, us)=>{
      if(!us || !us.length) return;
      const og = document.createElement("optgroup");
      og.label = label;
      us.forEach(u=>og.appendChild(new Option(u.displayName, u.id)));
      sel.appendChild(og);
    };
    CLASSES.forEach(c=>addGroup(c.name, byClass.get(c.id)));
    addGroup(T("amNoClass"), byClass.get("none"));
  }

  /* leerling-omgeving: welk eigen bord ziet een klas (standaard), of een individuele
     leerling (uitzondering voor wie op een ander niveau werkt) - zie roadmap-memo. */
  function renderToewijzingenPanel(panel){
    const schoolChosen = currentUser.role!=="super" || !!selSchool;
    if(!schoolChosen){
      panel.appendChild(h("div","guestnote", T("amPickSchoolHint")));
      return;
    }
    const boardOptions = [];
    BS.folders.forEach(fo=>fo.boards.forEach(bo=>boardOptions.push({ id: bo.id, label: `${fo.name} / ${bo.name}` })));

    panel.appendChild(h("div","am-group", T("amAssignClasses")));
    const classList = h("div","am-list");
    if(!CLASSES.length) classList.appendChild(h("div","guestnote", T("amNoClass")));
    CLASSES.forEach(c=>classList.appendChild(assignmentRow({type:"class", id:c.id, label:c.name}, boardOptions, ASSIGNMENTS[c.id])));
    panel.appendChild(classList);

    panel.appendChild(h("div","am-group", T("amAssignPupils")));
    const pupils = USERS.filter(u=>u.role==="pupil");
    const pupilSel = h("select","am-sel");
    fillPupilSelect(pupilSel, pupils);
    panel.appendChild(pupilSel);
    const pupilRowHolder = h("div");
    panel.appendChild(pupilRowHolder);
    pupilSel.addEventListener("change", async ()=>{
      pupilRowHolder.innerHTML = "";
      if(!pupilSel.value) return;
      const u = pupils.find(x=>String(x.id)===pupilSel.value);
      let current = null;
      try{ current = (await api("/assignments/pupil/"+u.id)).assignment; }catch(e){}
      pupilRowHolder.appendChild(assignmentRow({type:"pupil", id:u.id, label:u.displayName}, boardOptions, current));
    });
  }

  /* één regel in de voortgangstijdlijn van een leerling: widgettype, score en tijdstip */
  function progressRow(ev){
    const row = h("div","am-row");
    row.appendChild(h("span","am-name", T("wg_"+ev.widgetType) || ev.widgetType));
    const scoreParts = [];
    if(ev.attempts) scoreParts.push(`${ev.correct}/${ev.attempts} ${T("mGoed")}`);
    if(ev.stars) scoreParts.push("★".repeat(ev.stars));
    row.appendChild(h("span","am-code", scoreParts.join(" · ")));
    row.appendChild(h("span","am-code", new Date(ev.createdAt).toLocaleString(LANG==="nl" ? "nl-NL" : "en-GB")));
    return row;
  }

  /* voortgang: leerkracht kiest een leerling (zelfde groepering per klas als
     Toewijzingen) en ziet de volledige tijdlijn van diens afgeronde
     widget-momenten (ronde sommen, voltooid woord, geknapte ballon). */
  function renderVoortgangPanel(panel){
    const schoolChosen = currentUser.role!=="super" || !!selSchool;
    if(!schoolChosen){
      panel.appendChild(h("div","guestnote", T("amPickSchoolHint")));
      return;
    }
    const pupils = USERS.filter(u=>u.role==="pupil");
    const pupilSel = h("select","am-sel");
    fillPupilSelect(pupilSel, pupils);
    panel.appendChild(pupilSel);
    const eventsHolder = h("div","am-list");
    panel.appendChild(eventsHolder);
    const moreBtn = h("button","am-btn", T("amShowMore"));
    moreBtn.type = "button";
    moreBtn.style.display = "none";
    panel.appendChild(moreBtn);
    pupilSel.addEventListener("change", async ()=>{
      eventsHolder.innerHTML = "";
      moreBtn.style.display = "none";
      if(!pupilSel.value) return;
      let events = [];
      try{ events = (await api("/progress/pupil/"+pupilSel.value)).events || []; }
      catch(e){ msg(e.message); return; }
      if(!events.length){ eventsHolder.appendChild(h("div","guestnote", T("amProgressEmpty"))); return; }
      /* in porties van 30: de tijdlijn kan 200 regels lang zijn */
      let shown = 0;
      const showMore = ()=>{
        events.slice(shown, shown+30).forEach(ev=>eventsHolder.appendChild(progressRow(ev)));
        shown = Math.min(shown+30, events.length);
        moreBtn.style.display = shown < events.length ? "" : "none";
        moreBtn.textContent = `${T("amShowMore")} (${events.length - shown})`;
      };
      moreBtn.onclick = showMore;
      showMore();
    });
  }

  /* zoekfilter + inklapbare groepen voor de gebruikerslijst: één plek die de
     zichtbaarheid bepaalt (style.display i.p.v. her-render, zodat het zoekveld
     focus houdt). Ingeklapte groepen verbergen hun rijen; zodra er gezocht
     wordt tellen alle groepen mee zodat een treffer nooit verstopt zit. */
  function applyUserFilter(panel){
    const q = userFilter.trim().toLowerCase();
    /* expliciet de gebruikerslijst: het Aanmeldingen-blok erboven is ook een
       .am-list maar valt buiten het zoekfilter en de groepslogica */
    const list = panel.querySelector(".am-userlist") || panel.querySelector(".am-list");
    if(!list) return;
    let curGroup = null, groupVisible = false;
    const closeGroup = ()=>{
      if(curGroup) curGroup.style.display = (groupVisible || curGroup.dataset.collapsible) ? "" : "none";
    };
    [...list.children].forEach(el=>{
      if(el.classList.contains("am-group")){
        closeGroup();
        curGroup = el; groupVisible = false;
        return;
      }
      const collapsed = curGroup && curGroup.dataset.collapsible
        && !openGroups.has(curGroup.dataset.gkey) && !q;
      if(el.classList.contains("am-row")){
        const name = el.querySelector(".am-name");
        const match = !q || (name && name.textContent.toLowerCase().includes(q));
        el.style.display = (match && !collapsed) ? "" : "none";
        if(match) groupVisible = true;
      }else{
        /* toevoegrij (am-add-wrap): volgt de ingeklapte staat van zijn groep */
        el.style.display = collapsed ? "none" : "";
      }
    });
    closeGroup();
  }

  /* gebruikers: lijst (altijd, ook zonder gekozen school) + aanmaak-formulieren.
     Leerlingen krijgen een aparte behandeling: voor schoolbeheerder/super gegroepeerd
     per klas (met een inline toevoegrij per klas), voor groepsleiding een platte lijst
     (die dankzij de server-side scope toch al beperkt is tot de eigen klas(sen)). */
  /* aanmeldverzoek van een ouder (thuiskind -> deze school): de school kiest
     adopteren (thuisaccount wordt de schoolleerling, evt. met klas en - bij
     naamconflict - een andere gebruikersnaam), koppelen aan een bestaande
     leerling, of afwijzen */
  /* aanmeldverzoek als tabelrij; afhandelen gebeurt in het detailpaneel */
  function requestCells(r){
    const row = h("div","am-row am-tr");
    row.dataset.selkey = "req:"+r.id;
    row.appendChild(nameCellFor(r.pupil.displayName, r.pupil.username));
    row.appendChild(h("span","am-cell", T("amRequestOne")));
    row.appendChild(h("span","am-cell", `${T("amRequestVia")} ${r.parent.displayName}`));
    const stCell = h("span","am-cell am-status");
    stCell.appendChild(h("span","am-chip on", T("amReqNew")));
    row.appendChild(stCell);
    row.addEventListener("click", ()=>{ selectedUserKey = "req:"+r.id; syncSelection(); });
    return row;
  }
  function requestTools(r){
    const tools = h("div","am-tools");

    const adoptWrap = h("div","am-inline");
    const cs = classSel(null);
    const un = h("input","am-inp");
    un.placeholder = T("amAdoptUserPh");
    un.style.display = "none";
    un.addEventListener("keydown", ev=>ev.stopPropagation());
    const adopt = h("button","am-btn", T("amAdopt"));
    adopt.type = "button";
    adopt.addEventListener("click", async ()=>{
      const body = { action:"adopt", classId: cs.value ? +cs.value : null };
      if(un.style.display!=="none" && un.value.trim()) body.username = un.value.trim();
      try{ await api("/admin/link-requests/"+r.id+"/resolve", { body }); selectedUserKey = null; reload(); }
      catch(e){
        /* naamconflict binnen de school: veld tonen om direct een andere
           gebruikersnaam mee te geven */
        if(e.status===409){ un.style.display = ""; un.focus(); }
        msg(e.message);
      }
    });
    adoptWrap.appendChild(cs);
    adoptWrap.appendChild(un);
    adoptWrap.appendChild(adopt);
    tools.appendChild(field("amAdopt", adoptWrap));

    const matchWrap = h("div","am-inline");
    const ms = h("select","am-sel");
    fillPupilSelect(ms, USERS.filter(u=>u.role==="pupil"));
    const mb = h("button","am-btn", T("amMatchBtn"));
    mb.type = "button";
    mb.addEventListener("click", async ()=>{
      if(!ms.value) return;
      try{ await api("/admin/link-requests/"+r.id+"/resolve", { body:{ action:"match", pupilId: +ms.value } }); selectedUserKey = null; reload(); }
      catch(e){ msg(e.message); }
    });
    matchWrap.appendChild(ms);
    matchWrap.appendChild(mb);
    tools.appendChild(field("amMatchBtn", matchWrap));

    const actions = h("div","am-actions");
    actions.appendChild(dangerBtn(T("amReject"), "amRejectWarn", async ()=>{
      try{ await api("/admin/link-requests/"+r.id+"/resolve", { body:{ action:"reject" } }); selectedUserKey = null; reload(); }
      catch(e){ msg(e.message); }
    }));
    tools.appendChild(field("amFieldActions", actions));
    return tools;
  }

  function renderGebruikersPanel(panel){
    const schoolChosenTop = currentUser.role!=="super" || !!selSchool;
    /* werkbalk: zoeken links, nieuwe gebruiker rechts */
    const bar = h("div","am-toolbar");
    const filterInp = h("input","am-inp am-filter");
    filterInp.type = "search";
    filterInp.placeholder = T("amSearchPh");
    filterInp.value = userFilter;
    filterInp.addEventListener("keydown", ev=>ev.stopPropagation());
    filterInp.addEventListener("input", ()=>{ userFilter = filterInp.value; applyUserFilter(panel); });
    bar.appendChild(filterInp);
    if(schoolChosenTop && creatableRoles().some(r=>r!=="super")){
      const add = h("button","am-btn am-primary", T("amNewUser"));
      add.type = "button";
      add.addEventListener("click", ()=>{ selectedUserKey = "new"; syncSelection(); });
      bar.appendChild(add);
    }
    panel.appendChild(bar);

    /* master (tabel) + detail (bewerkpaneel) */
    const split = h("div","am-split");
    const master = h("div","am-master");
    const detail = h("div","am-detail");
    masterHost = master; detailHost = detail;

    /* openstaande aanmeldingen bovenaan: dit vraagt actie van de school */
    if(LINK_REQUESTS.length){
      master.appendChild(h("div","am-group", `${T("amLinkRequests")} (${LINK_REQUESTS.length})`));
      const rl = h("div","am-reqlist am-list");
      LINK_REQUESTS.forEach(r=>rl.appendChild(requestCells(r)));
      master.appendChild(rl);
    }
    /* kolomkoppen boven de tabel */
    const thead = h("div","am-thead");
    ["amFieldName","amFieldRole","amFieldClass","amColStatus"].forEach(k=>thead.appendChild(h("span",null,T(k))));
    master.appendChild(thead);

    const list = h("div","am-list am-userlist");
    /* inklapbare groepskop; standaard dicht tenzij defaultOpen (dan onthoudt
       closedGroups een bewuste dichtklap). Zoeken kijkt door alle groepen heen. */
    const group = (key, label, us, defaultOpen)=>{
      if(defaultOpen && !closedGroups.has(key)) openGroups.add(key);
      const g = h("div","am-group am-group-toggle");
      g.dataset.collapsible = "1";
      g.dataset.gkey = key;
      const sync = ()=>{ g.textContent = `${openGroups.has(key) ? "▾" : "▸"} ${label} (${us.length})`; };
      sync();
      g.addEventListener("click", ()=>{
        if(openGroups.has(key)){ openGroups.delete(key); closedGroups.add(key); }
        else{ openGroups.add(key); closedGroups.delete(key); }
        sync();
        applyUserFilter(panel);
      });
      list.appendChild(g);
      us.forEach(u=>list.appendChild(userCells(u)));
    };

    if(currentUser.role==="super" && !selSchool){
      /* ALLE SCHOLEN: groepeer per school zodat je meteen ziet wie waar hoort;
         daarna systeemmanagers, ouders en losse accounts apart */
      const roleOrder = { admin:0, teacher:1, pupil:2 };
      SCHOOLS.forEach(sc=>{
        const us = USERS.filter(u=>Number(u.schoolId)===Number(sc.id))
          .sort((a,b)=>(roleOrder[a.role]??9)-(roleOrder[b.role]??9) || a.displayName.localeCompare(b.displayName));
        if(us.length) group("gschool:"+sc.id, sc.name, us);
      });
      const supers = USERS.filter(u=>u.role==="super");
      if(supers.length) group("gsys", T("amSuperGroup"), supers);
      /* systeemmanagers horen niet bij één school, dus het aanmaken ervan
         staat hier (bij "alle scholen") i.p.v. tussen de school-gebonden
         gebruikers - met een extra bevestigingsstap (eigen wachtwoord). */
      if(creatableRoles().includes("super")) list.appendChild(addForm("super"));
      const parents = USERS.filter(u=>u.role==="parent");
      if(parents.length) group("gparents", T("amParents"), parents);
      const loose = USERS.filter(u=>["teacher","admin","pupil"].includes(u.role) && u.schoolId==null);
      if(loose.length) group("gnoschool", T("amNoSchoolGroup"), loose);
    }else{
      /* één school gekozen: groepeer op rol, leerlingen per klas */
      [["admin", T("roleAdmin")], ["teacher", T("roleTeacher")]].forEach(([role, label])=>{
        const us = USERS.filter(u=>u.role===role);
        if(us.length) group("role:"+role, label, us, true);
      });
      const pupils = USERS.filter(u=>u.role==="pupil");
      if(currentUser.role==="teacher"){
        if(pupils.length) group("pupils", T("amPupils"), pupils, true);
      }else{
        CLASSES.forEach(c=>{
          const us = pupils.filter(u=>u.classId===c.id);
          if(us.length) group("class:"+c.id, c.name, us, true);
        });
        const noClass = pupils.filter(u=>!u.classId);
        if(noClass.length) group("class:none", T("amNoClass"), noClass, true);
      }
      const parents = USERS.filter(u=>u.role==="parent");
      if(parents.length) group("parents", T("amParents"), parents);
    }
    master.appendChild(list);
    split.appendChild(master);
    split.appendChild(detail);
    panel.appendChild(split);

    applyUserFilter(panel);
    syncSelection();   /* selectie valideren + detailpaneel vullen */
  }

  function switchAdminTab(tab){
    adminTab = tab;
    modal.querySelectorAll(".am-tabpanel").forEach(p=>{ p.style.display = p.dataset.panel===tab ? "block" : "none"; });
    /* het Systeem-tabblad is school-onafhankelijk: daar is de schoolkiezer
       alleen maar verwarrend, dus die verbergen we er */
    const sb = modal.querySelector(".am-schoolbar");
    if(sb) sb.style.display = ["scholen","opslag"].includes(tab) ? "none" : "";
  }

  /* vaste contextbalk voor de systeemmanager: op elk beheer-tabblad direct
     de school kiezen, zonder eerst naar het Systeem-tabblad te moeten */
  function schoolContextBar(){
    if(currentUser.role !== "super") return null;
    const bar = h("div","am-schoolbar");
    bar.appendChild(h("span","am-schoolbar-lbl", T("amFieldSchool")));
    const sel = h("select","am-sel");
    sel.appendChild(new Option(T("amAllSchools"), ""));
    SCHOOLS.forEach(s=>sel.appendChild(new Option(s.name, s.id)));
    sel.value = selSchool ?? "";
    sel.setAttribute("aria-label", T("amPickSchool"));
    sel.addEventListener("change", ()=>{ selSchool = sel.value; selectedUserKey = null; reload(); });
    bar.appendChild(sel);
    return bar;
  }

  function render(){
    modal.innerHTML = "";
    const sb = schoolContextBar();
    if(sb) modal.appendChild(sb);
    modal.appendChild(h("div","am-msg"));
    const rp = resetPanel();
    if(rp) modal.appendChild(rp);

    const tabDefs = adminTabDefs();
    if(!tabDefs.some(([t])=>t===adminTab)) adminTab = tabDefs[0][0];

    const panels = { scholen: renderScholenPanel, klassen: renderKlassenPanel, gebruikers: renderGebruikersPanel, toewijzingen: renderToewijzingenPanel, voortgang: renderVoortgangPanel, opslag: renderImageStoragePanel };
    tabDefs.forEach(([t])=>{
      const panel = h("div","am-tabpanel");
      panel.dataset.panel = t;
      panels[t](panel);
      modal.appendChild(panel);
    });

    switchAdminTab(adminTab);
  }
})();